fix: refuse implausible accommodation booking prices

tests/Controller/Admin/AccommodationBooking/ChangeAccommodationControllerTest.php

@@ -8,6 +8,7 @@ use App\Controller\Admin\AccommodationBooking\ChangeAccommodationController;
 use App\Entity\Groups\Accommodation;
 use App\Entity\Groups\AccommodationBooking;
 use App\Enum\Groups\AccommodationBookingStatus;
+use App\Exception\ImplausibleBookingPriceException;
 use App\Service\AccommodationBookingService;
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
@@ -87,6 +88,36 @@ class ChangeAccommodationControllerTest extends TestCase
         self::assertSame('success', $controller->flashes[0]['type']);
     }
 
+    public function testAHouseThatPricesImplausiblyIsReportedInTheModal(): void
+    {
+        // The service leaves the booking at its old house and rethrows; the office has to see why
+        // the change did not happen, on the modal it just submitted, not as an error page.
+        $booking = $this->draft();
+
+        $bookingService = $this->createStub(AccommodationBookingService::class);
+        $bookingService->method('changeAccommodation')
+            ->willThrowException(new ImplausibleBookingPriceException(AccommodationBooking::MAX_TOTAL_PRICE + 1, 40, 2));
+
+        $field = $this->createStub(FormInterface::class);
+        $field->method('getData')->willReturn(new Accommodation());
+
+        $form = $this->createMock(FormInterface::class);
+        $form->method('handleRequest')->willReturn($form);
+        $form->method('isSubmitted')->willReturn(true);
+        $form->method('isValid')->willReturn(true);
+        $form->method('get')->with('accommodation')->willReturn($field);
+        $form->expects(self::once())->method('addError');
+
+        $controller = $this->buildController($bookingService, $form);
+
+        $response = $controller->index($booking, $this->request('POST'));
+
+        self::assertSame(Response::HTTP_OK, $response->getStatusCode());
+        self::assertFalse($response->headers->has('HX-Redirect'), 'the modal stays open on the error');
+        self::assertSame('admin/accommodation_booking/modal_change_accommodation.html.twig', $controller->renderedView);
+        self::assertSame([], $controller->flashes, 'nothing was changed, so nothing is reported as success');
+    }
+
     public function testPickingTheSameHouseIsNotReportedAsAChange(): void
     {
         $booking = $this->draft();